Tamping machine



y 1942- A. SCHMIDT 2,284,072

TAMPING MACHINE Filed April 6, 1959 2 Sheets-Sheet 1 11v VENTOR Ared 52-19mm A TTORNEV May 26, 1942. A. SCHMIDT 2,234,072

TAMPING MACHINE Filed April 641939 2 Sheets-Sheet 2 ATTO EY Patented May 26, 1942 2,234,072 TAMPING MACHINE Alfred Schmidt, Weehawken, N. J. Application April 6, 1939, Serial-No. 266,406

3 Claims.

My invention relates to improvements in tamping or stamping machines-of the type which are used extensively in various industries for the automatic molding of plastic or other powders into various forms, as well as for the preeforming of definite amounts of such plastic powders" preliminary to the actual molding process.

Machines of this type have formerly had a revolving turret with a sliding crosshead performing the injecting and ejecting operations from one side of the turret. There has also been a mechanically operated tamping hammer which has been hand fed and it was always necessary to take off the finished product by hand. In the present invention has been added a new automatic feed'of the powder and automatic ejecting means on the rear of the turret which permits the taking off of the finished product directly upon a belt conveyor, thus permitting continuous automatic operation at a much greaterrate of production. While formerlytheturfet was driven by a four-point Geneva drive the present invention ultili zes an eight -point drive as well as multiple dies in the turret permitting a large increase in the rate of production. Other new improvements are to be found in the double drive of the crosshead and in the welded frame construction.

An important object of the invention is to provide a tamping machine permitting a larger rate of production at a'lower cost.

Other objects and advantages of the invention will be apparent during the course of the followingdescriptiori. T V w In the accompanying drawings, forming part of this specification, and in which like numerals are employed to designate like parts throughout the sameg Figure 1 is a plan view of the machine, Figure 2 is a side elevation of the's-ame,

Figure 3 is a sectional elevation along line 3-3.in Figure 1, g

Figure 4 is a partial section along line ,4-4 in Fig. 1,

Figure 5 is a perspective view of a bobbin, and, 'Figure6 is a partial elevation along line 66 in Figure 1.

In the drawings, wherein for the purpose of illustration, is shown a preferred embodiment of my invention, the numeral designates the vertical I-beams forming part ofthe welded frame construction and providing the four legs upon which the machine stands. The vertical I-beams ID are welded to two longitudinal I-beams II and plates l2 are welded to beams l0 to form supports for same. The flywheel l3'serves also as a pulley and a belt, or plurality of belts, conf nects this pulley with the pulley of the driving motor, which for the sake of simplicity and clarity has not been indicated in the drawings.

A pinion l4 mounted on the flywheel shaft I5,

engages gear [6 driving shaft I! which rotates in bearings l8 and I9 while shaft I is journalled The shaft H isdriven' in bearings and 2|. by gear l6 through acoupling 22. A bevel gear 23 is rigidly mounted upon shaft I! on the outside of bearing I9 while both ends of shaft I! carry cranks 24 which operate the two connecting rods 25.

A bevel gear 26 is in engagement with 23 and I in bearings 33 and 34. A cam 35 mounted on the other end of shaft 32 lifts and drops the hammer support 36 which slides in slide 31 which is mounted upon" the longitudinal beam H. The hammer support 36 has a horizontal arm extending at right angles from 36 and forming the support upon which the hammer head 39 is mounted. In cases where explosive powders are han dled the hammer head 39 is made from wood or other suitable materials which willnot strike sparks.

Referring to Fig. 1, shaft 21 carries a Geneva drive 40 with the pin 4| engaging the slotted disc 42. Disc 42 has eight slots equally spaced around its circumference, one turn of shaft 21 will thus give the disc 42 one-eighth of a turn. Disc 42 is mounted on the end of shaft 43 which turns in bearings 44 and 45 mounted on cross members between the longitudinal beams H. The

other end of shaft 43 carries the turret 46 and .the pulley 41 with the conveyor belt 48, see also.

Figure 3. I The turret 46 carries'the dies 49 which are. arranged in radiallines with 45 degree spacing. The turret shown in Figure 3 has two sets of dies 49 in each position, but three or more dies per position may be used if desired.

The connecting rods 25 link cranks 24 with the two sliding shafts 50 which are slidable through bearings 5| and 52.

and 51 are of proper diameters to fit the dies 49 in turret 46.

Referring now to Figure 3, the powder to be formed is put into hopper where an agitator 6| rotates and keeps the powder from setting. A feeding device consisting of plunger 62 is mounted at the bottom of hopper 69. The plunge er 62 isoperated by lever 63 which may be given A crosshead 53 is mounted transversally upon two ends of shafts a reciprocating motion by a cam located on shaft 7 32. The plunger 62 pushes the powder through opening 64 into the tamping box 65. The 'tamping box 65 has holes65a on both ends which line up with punchesr'L; v 7 The embodiment of the inventionshown inthe drawings is a tamping machine especially suited finished bobbins out onibelt 48.

to produce the so-called bobbins? used as cores,

in' the manufacture of' electric dry batteries.

bobbin of this type is shown in Fig. 5-where the cylindrical body 66 is made from the depolarizing powder while 6! is the carbon rod forming'the positive pole of the battery. FI-hercarbontrod 61" is inserted through a hole .in the centre of,

body 66.

Referring now to- Figure 3, the hopper- 68- is filled with'the carbon-rods 61. These are fed.

through-a:device driven :by ratchet 69 withhold; 7

ing pawl-10 and driving pawl H. The latter is mounted upon a lever 12 rotatably mounted at' one end, the other'end being driven by rod" 13* whichreceives a reciprocating motionfrom the V crosshead 53. Through theratchet driven means the carbon rods 61 are fed one at a tim downthe inclined'guide channel! 14-into chamber 15:}

Aguide structure 16 is mounted-at the headrotatable shaft, a turret on said shaftfhaving After the machine is in 'full swing the four last mentioned operations will be carried out simultaneously.

J; 'It'ii'si. to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of my invention, or the scopeof the subjoined claims;

Having thus described my; invention Ijclaimz 1. In a tampingmachine, an intermittently molds"; therein for forming,bobbins,.means for" pushing bobbins out of saidmolds' during, that endof the machine andextendsover the turret 46. This guide block contains the guide holes H and 18 which serve to guidezpunchese55-and 56: as well as carbon rods 61-. p

Referring now to Figures 1;and 6, the ejector mechanism ismounted on the rear, of turrett46.

Itconsists of punch rods;'|9 and 80,:oneforeach,

ofthe dies 49 in oneposition. The punch rods Hand 80 are slidably-mounted inbearings 8| and 82 which again are-mounted, bybracket. 83 upon I-beam I6. A leverv 84 with itsfulcrum at 851s fastened'at'one end'to block- 86 andits other endis given a reciprooatingmotion through rod 81 which extends toward thetail end of-themachine past the turret 46 to a position where; the-end will be hit by the crosshead 53r The end of rod 81- carries-a bo1t 88 and lock-nut '89 where bythe length oithe stroke may bgadjusted: V

; A structure- 56 *is" mounted across the vertical; I -beams' ID- at the head-of the machine. This structure 90 carries a number of-rods:9.l, 92, 93a

and-94 the ends of whichare linedup close to: the'rear of -dies 49' and act as bottomsforthese;

see'Fig; 1; r i

The, operation of-the machine consistswf the; following unit operations :whichare carried out nearly simultaneously during each stroke-of the.

, crosshead r53:

1. Theturret 46- is moved %turn by the Gee neva drive,.and then held in a: rigidposition during theremainder of the cycle.

2. The powder-to be formed-flows down from the hopper and a measured .quantityis pushed into the chamber 65 -by plunger (i2,

3 The. hammer headi39- comes down andtampsi' the powder into a more solidmass.

compressed into a solid cylindrical body;

period when the. turret' stationary, a pulley mounted on said shaft'adjacent said-turret, and a conveyor belt engaged over saidv pulley, for receiving said discharged bobbins;

1,2. 'In a tamping machinefhaving a turret. with dies formed with openings extending, completely through thematerial' thereof ,from the front-to the back for receiving the bobbin bodies, a tamping'bo'xadjacent the front side ofv said turretand having an open: top and a side opening in its side andopenings itsfront and back sidesiwhicharein line 'with' saidropenings in said dies, a

. hopper for thepowder to beformedinto bobbins located adjacent the latter named sideof said,

tamping-box, ,a: plungerv in saidv hopperv for forcing; a quantity of" said powder through said side,

opening in the tampingVbox-andinto the tampthe powder in saidtampingbox intosaid dies, a

hammer extending into the open top. of? said':

tamping box, and means. for operating. said hammer to compress the powder in'said tamping box, comprising ahammersupport for said hammer and .slidably mounted, and a cam: for: raising anddropping saidihammer support.

3. In a tamping machine having: a turretwith dies-formed withopenings extending completely through thematerial thereofifrom" the front'wto binslocatedadjacent'the latter named side, of

5 As the turret next is moved 45 degreesin a counterclockwise direction, as referred toFigure 3, the punches 56 will during the next cycleof 1 the crosshead move in through the guide openings ,18 and punch a hole in the; compressed powder cylinder.

6-. Thevturret is next movedanother step ahead and-during the following cycle ofthe crosshead the punches 55 enter through guide openings 11 said tamping box, a plunger in said hopper. for

forcing a quantity of said powder throughsaid side opening in thetamping' box and" into the tamping box, a punch for extending through said openings in the front and back sides of' said tamping box for forcing bobbin bodies'cut from the powder-in saidtamping box into said dies, a

hammer extending into the open top of said tamping .box', and means for operating said hammer to :compress the powder in said tamping, 

